Once parents get used to the fact that they will have twins in a few months, they start to think about how the children will look like and if they will be similar.
To find out, you need to wait patiently and hope that everything will go as expected. When an egg cell is fertilized by a single sperm and then the egg cell splits into two embryos the children to be will be genetically identical. In a situation when two egg cells are fertilized by two sperms, the parents may expect fraternal twins who might not be very similar.
The children will have completely different genes and they might be of different sex. Sometimes (however incredibly rarely), after ovulation, an additional egg cell is released and it can be fertilized by another sperm from another intercourse (with another man).
A Vietnamese family from Hoa Binh province had twins. Everyone was extremely excited and happy to have not one but two sweet toddlers. After two years, a marked difference in their appearance was noticed. What was the reason of that? You will find out on the next page.